Cita APA (7a ed.)

GARTSIDE, L. (1989). Model business letters.-- Ed.3. Binarupa Aksara.

Cita Chicago Style (17a ed.)

GARTSIDE, L. Model Business Letters.-- Ed.3. Jakarta: Binarupa Aksara, 1989.

Cita MLA (9a ed.)

GARTSIDE, L. Model Business Letters.-- Ed.3. Binarupa Aksara, 1989.